[Libav-user] ffmpeg on android - cannot write output file

[wm4]

On Fri, 13 Feb 2015 10:08:29 -0600
Cen-bi Liu <cenbiliu at gmail.com> wrote:

> Hi all,
> 
> I'm new to ffmpeg and trying to use ffmpeg as a shared library in Android
> to convert PCM to an .mp4 file by following tutorials.
> 
> I hit a snag in my openOutputFile function, I have the following which has
> given me an error (passing in "/sdcard/a.mp4" for filename):
> 
> if ((error = avio_open(&output_io_context, filename,
>                        AVIO_FLAG_WRITE)) < 0) {
>     __android_log_print(ANDROID_LOG_ERROR, "encoder","couldn't open
> output file");
>     exit(1);}
> 
> My configure for ffmpeg compilation is as follows:
> 
> ./configure \--prefix=$PREFIX \--enable-demuxer=mov
> \--enable-muxer=mov \--enable-libvpx \--enable-libvorbis
> \--enable-protocol=file \--enable-shared \--disable-static
> \--disable-doc \--disable-ffmpeg \--disable-ffplay \--disable-ffprobe
> \--disable-ffserver \--disable-avdevice \--disable-symver
> \--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi-
> \--target-os=linux \--arch=arm \--enable-cross-compile
> \--sysroot=$SYSROOT \--extra-cflags="-Os -fpic $ADDI_CFLAGS"
> \--extra-ldflags="$ADDI_LDFLAGS" \
> 
> When searching, I have come across others' experiencing similar issues and
> added the --enable-protocol=file and --enable-muxer=mov when compiling
> ffmpeg. I did add the permissions to external storage in the manifest.xml
> file. Please let me know what you think.
> 
> Cheers,
> 
> Cen

Does fopen() work?